Questions Asked on
April 5, 2014

  1. College Physics

    Two forces, F⃗ 1 and F⃗ 2, act at a point, as shown in the picture. (Figure 1) F⃗ 1 has a magnitude of 8.20N and is directed at an angle of α = 55.0∘ above the negative x axis in the second quadrant. F⃗ 2 has a magnitude of 6.40N and is directed

    asked by Danilo
  2. physics

    In a dentist's office, an X-ray of a tooth is taken using X-rays that have a frequency of 7.01 1018 Hz. What is the wavelength in vacuum of these X-rays?

    asked by Anonymous
  3. Math

    Find the exact length of the curve. x = 5cost - cos5t, y = 5sint - sin5t, 0 < t < pi

    asked by Anonymous
  4. Chemistry

    Consider the following reaction. A(aq) (Two way arrows) 2B(aq) Kc = 7.94*10^-6 at 500K If a 2.70 M sample of A is heated to 500K what is the concentration of B at equilibrium?

    asked by Janavi
  5. Physics

    One end of a uniform 3.20-m-long rod of weight Fg is supported by a cable at an angle of θ = 37° with the rod. The other end rests against the wall, where it is held by friction as shown in the figure below. The coefficient of static friction between the

    asked by Joe
  6. Chemistry

    For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 3.50 M)|Ag(s) write the net cell equation. I presume it is Cu + 2Ag^2+ --> Cu2+ + 2Ag Calculate the following values at 25.0 C using standard potentials as needed. Eocell = ? dGorxn =

    asked by Aki
  7. Math

    Skeletal remains had lost 84% of the C-14 they originally contained. Determine the approximate age of the bones. (Assume the half life of carbon-14 is 5730 years. Round your answer to the nearest whole number.)

    asked by Vanessa
  8. Calculus

    When a reservoir is created by a dam,50 fish are introduced into the reservoir ,which has an estimated carrying capacity of 8000 fish. A logistic model of the population is P(t)= 400,000 / 50 + 795e^-0.5t , where t is measured in years. How long does it

    asked by Dash
  9. Chemistry

    At a certain temperature, the Kp for the decomposition of H2S is 0.813. H2S (Two wa arrow) H2(g) + S(g) Initially, only H2S is present at a pressure of 0.280 atm in a closed container. What is the total pressure in the container at equilibrium?

    asked by Janavi
  10. Chem

    1) Which solution will have the lowest OH- A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 2) Which solution will be the strongest base? A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 3) Which aqueous solutions are acidic? A) Na2CO3 and NaHCO3 B) NaCl and

    asked by Timothy
  11. mathematics

    If Musa scored 75 in Biology instead of 57, his average mark in four subjects would have been 60. what was his total mark?

    asked by sunkanmi
  12. math

    A rental agent is renting a space for $7.50 a square foot. If you require a space 36 ft. by 16 ft., what will be the rental on that space?

    asked by Anonymous
  13. Psychology

    A hypothesis is an educated guess and as such must have the following characteristics: 1) can be proved or disproved 2) is based on some previous evidence 3) is an unsubstiantiated thought 4) is the basis of psychological research 5) all of the above 6) 1,

    asked by Indigo
  14. social studies check answers

    1.D 2.A 4.C 1.“Along the southern coast of Brazil the central plateau descends in high, steep escarpments. It towers over the waves and moves back in ridges, leveling off from the peaks of the coastal ranges … As it continues along to the northern

    asked by matt
  15. math

    If the angle of declination is known, a surveyor would use_______ to find the length x. The cosine of a 50° angle is_______ this represents the value created when length x is divided by 90 feet. If the angle of declination changed to 60°, the cosine

    asked by justin
  16. Math

    what is the degree of the polynomial 4x-2+5x^2?

    asked by Alice HELP HELP
  17. Math

    A radioactive substance decays according to the formula Q(t) = Q0e−kt where Q(t) denotes the amount of the substance present at time t (measured in years), Q0 denotes the amount of the substance present initially, and k (a positive constant) is the decay

    asked by Vanessa
  18. statistics

    Assume a binomial probability distribution has p = .60 and n = 200. a)What are the mean and standard deviation (to 2 decimals)? b)Why can the normal probability distribution be used to approximate this binomial distribution? c)What is the probability of

    asked by Vanessa
  19. math

    Use logarithmic differentiation to find the derivative of the function. y = (cos 2x)x

    asked by mat
  20. physics

    A 3.1-µF capacitor has a voltage of 31 V between its plates. What must be the current in a 5.6-mH inductor so that the energy stored in the inductor equals the energy stored in the capacitor?

    asked by Anonymous
  21. reading

    "THE thousand injuries of Fortunato I had borne as I best could, but when he ventured upon insult I vowed revenge. You, who so well know the nature of my soul, will not suppose, however, that gave utterance to a threat. At length I would be avenged; this

    asked by Reina B.
  22. reading

    He had a weak point --this Fortunato --although in other regards he was a man to be respected and even feared. He prided himself on his connoisseurship in wine. Few Italians have the true virtuoso spirit. For the most part their enthusiasm is adopted to

    asked by Reina B.
  23. math

    a rope was 9.45 meters. the length of the first piece of rope was 1/5 of the original length. the second piece of rope was 0.12 meter longer than the third piece.how long was the second piece of rope

    asked by eliu
  24. chemistry

    the following values are the only energy levels of a hypothetical one electron atom: E6= -2x10^-19J, E4= -11x10^-19J, E2= -17x10^-19J, E5= -7x10^-19L, E3= -15x10^-19J, E1= -20x10^-1J a: if the electon were in the n = 3 level, what would be the highest

    asked by hotmom
  25. math

    On a rectangular piece of cardboard with perimeter inches, three parallel and equally spaced creases are made (see Figure 1). The cardboard is then folded along the creases to make a rectangular box with open ends (see Figure 2). Letting represent the

    asked by Anonymous
  26. English

    Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Hypocritical, Homogenous, Piety, Pompous, Surmise, Susceptible, Validate, Catalyst. A. I said that he was POMPOUS because he pretends

    asked by Anonymous
  27. math

    Two angles are complementary. One contains 30° more than the other. Find both angles. The measures of the angles are _ degrees

    asked by justin
  28. Math

    If you are given a conditional statement that you know is true, can you predict whether i) the converse is true? ii) the inverse is true? iii) the contrapositive is true?

    asked by Theo
  29. math

    When a stone is thrown upwards with an initial velocity of v metres per second, it reaches a maximum height of h metres. h is directly proportional to the square of v. Calculate the value of v when h = 50 Please help

    asked by Felixe
  30. psychology

    A theory differs from a hypothesis in the following ways: Question 2 options: 1) they are proven hypotheses and are not subject to change 2) acts as a starting point for additional experiments 3) allows us to describe and explain observed behaviour 4) all

    asked by Indigo
  31. Physics 141

    The drawing shows a bicycle wheel resting against a small step whose height is h = 0.125 m. The weight and radius of the wheel are W = 23.1 N and r = 0.330 m, respectively. A horizontal force vector F is applied to the axle of the wheel. As the magnitude

    asked by dakota22
  32. Physics

    A 215-kg load is hung on a wire of length of 3.50 m, cross-sectional area 2.000x10^-5 m2, and Young's modulus 8.00x 10^10 N/m2. What is its increase in length?

    asked by Joe
  33. Math

    Can someone help me with this? Convert: 48lb/gal=____oz/qt

    asked by Unknown
  34. algebra

    if 25% of A is equal to 48, then what is 2/3 of A?

    asked by Anime
  35. English

    if people object vociferously they are objecting in a very ________

    asked by Anonymous
  36. Math

    The surface area of a prism is 54 square inches. What is the surface area of a similar prism that is smaller by a scale of 1/3?

    asked by Karley
  37. History

    Circa the fifteenth century, the status of women was higher in southeast asia that it was in China, India, or Europe. Why was this so?

    asked by Victoria
  38. math

    If a 1,000 unit vitamin D is equal to 10 glasses of milk how many glasses are in a 50,000 unit vitamin D?

    asked by Jessica
  39. Chemistry

    Calculate the concentrations of all species in a 0.390 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 and Ka2 = 6.3× 10–8. Species: Na+ SO3 2- HSO3 - H2SO3 OH- H+ Thanks! The only thing I seem to

    asked by Lynn
  40. Math

    How can you arrive at the distance between nail holes in string art. Mathematical concepts observed in string art

    asked by Juanita
  41. English

    To look with admiration at someone or something is to ______ but to look at something very closely is to _____. If we seek to verify something, we are seeking to find out if what we heard _____. If you doubt someone's veracity, you doubt that he or she is

    asked by Anonymous
  42. Please help!

    Hi, I really need help with this one. Determine the equation of g(x) that results from translating the function f(x) = x^2 + 3 upward 12 units Thank you.

    asked by Jerry
  43. occupational therapy

    Mrs. Richards is a 79 year old widow who is in the skilled nursing facility secondary to a falling incident which injured her left shoulder. she has a history of rheumatoid arthritis which also impacts her active range of motion in bilateral upper

    asked by Anonymous
  44. Algebra

    Please help. f(x) -6x-1 and g(x)=4x^2 Select the solution for(f+g)(x). Thank you.

    asked by Jerry
  45. physics

    A bomb of mass M at rest explodes into three pieces in the ratio 1 : 1 : 2. The smaller ones are thrown off in perpendicular directions with velocities 3 ms−1 and 4 ms−1. What is the velocity of the third piece after the explosion?

    asked by bharath
  46. Statistics

    The height of a certain species of a tree are normally distributed with a mean of 30ft and stand dev of 4ft. If a random sample of 16 of these trees is taken, what is the probability that the sample mean is less than 32fy?

    asked by Tammy
  47. Math

    Convert- 94 gal/h=______L/min

    asked by Unknown
  48. history

    during the slave trade, what was shore trading?

    asked by Victoria
  49. mathematics

    A man invested a sum of N280.00 partly at 59% and partly at 4%. If the total interest is N12.80 per annum, find the amount invested at 5%.

    asked by sunkanmi
  50. English

    Help! Left my book in my locker and this assignment over George Orwell's novel 1984 are due this monday! My teacher gave us an assignment and the instructions are to find a quote from every chapter in part three and say how it shows Winston's downward

    asked by Arthur
  51. SAT math

    A family of 2 parents and 4 children is eating lunch at a rectangular table with 2 chairs on each side and one chair on each end. In how many ways can they be arranged if the two parents sit in the two end chairs? a. 12 b. 30 c. 36 d. 48 e. 720

    asked by Paula
  52. maths

    Find the total surface area of a solid cone of radius 2√3cm and slanting side 4√3cm

    asked by sunkanmi
  53. Geometry

    A certain Circle of paper has x degrees cut out of it. The two cut edges are taped together, curling the paper up into a right circular cylinder of height 8 and with a base of radius 6. What is the value of x? A) 74 B) 90 C) 120 D )144 E) 200

    asked by diana
  54. Biographical Essay Evaluation (Writeacher)

    Revision of the second paragraph: "Leisure time is another one of my favorite things about summer. It brings me happiness beyond belief. It enables me to spend time with my family, to take part in the things they wish to do. It enables me to live life

    asked by Anonymous
  55. Math

    "If a quadrilateral is a rectangle, then it is a parallelogram." i) is the converse true? ii) is the inverse true? iii) is the contrapositive true?

    asked by Theo
  56. physics

    A brass ring of diameter 10.00 cm at 22.2°C is heated and slipped over an aluminum rod of diameter 10.01 cm at 22.2°C. Assume the average coefficients of linear expansion are constant. (b) What if the aluminum rod were 9.16 cm in diameter?

    asked by niti
  57. math

    Evaluate the indefinite integral of the following function, e^sec2x sec2xtan2x dx

    asked by mahes
  58. English

    Put the following words in the correct place in these sentences. Revoke, Provoke, Invoke A. If we put something off until later, we _____ it. And something done for posterity is done for ____. If a Congressional Medal of Honor is awarded posthumously, it

    asked by Anonymous
  59. maths

    find the value of log49to7

    asked by divya
  60. CHEMISTRY

    Write the net ionic equation for the reaction between potassium hydroxide and copper(I) nitrate.

    asked by Michael
  61. Algebra

    Maria and Charlie can deliver 50 papers in 2 hours. How long would it take them to deliver 35 papers? formula please

    asked by jorge
  62. physical science

    Provide three statements that demonstrate the importance of units when describing motion.

    asked by steve
  63. STATS

    Suppose we are testing the null hypothesis H0: ì = 20 and the alternative Ha: ì 20, for a normal population with ó = 5. A random sample of 25 observations are drawn from the population, and we find the sample mean of these observations is = 17.6. The

    asked by Tracy
  64. math

    Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your

    asked by Vanessa
  65. Math

    The growth rate of Escherichia coli, a common bacterium found in the human intestine, is proportional to its size. Under ideal laboratory conditions, when this bacterium is grown in a nutrient broth medium, the number of cells in a culture doubles

    asked by Vanessa
  66. Chemistry

    a solution is prepared by dissolving 50 g of calcium chloride in a 250ml volumetric flask which is then filled with distilled water up to the line-mark. Calculate the molar concentration of the solution.

    asked by Huda
  67. Statistics

    a procedure in REGRESSION NALYSIS WHERE PREDICTOR OR INDEPENDENT VARIABLES ARE CODED AS 1 OR 0 (REPRESENTING CATEGORIES) AND CAN BE USED TO PRODUCE ANOVA TABLES UNDER THE GENERAL LINEAR MODEL IS KNOWN AS?

    asked by Jo
  68. Math

    The length (in centimeters) of a typical Pacific halibut t years old is approximately f(t) = 190(1 − 0.955e−0.25t). How fast is the length of a typical 9-year-old Pacific halibut increasing? ? cm/yr (c) What is the maximum length a typical Pacific

    asked by Vanessa
  69. Math

    The percentage of a certain brand of computer chips that will fail after t years of use is estimated to be P(t) = 100(1 − e−0.12t ). What percentage of this brand of computer chips are expected to be usable after 3 years? (Round your answer to one

    asked by Vanessa
  70. Math

    During a flu epidemic, the number of children in the Woodbridge Community School System who contracted influenza after t days was given by the following. Q(t) = 7000 1+249 e−0.6 t (a) How many children were stricken by the flu after the first day? (b)

    asked by Vanessa
  71. english writing

    what is the best way to start a memoir about my first job experience? thank you

    asked by moxxy
  72. 6th Grade Science - Help

    Which of Earth's spheres has the most mass? 1. atmosphere 2. hydrosphere 3. geosphere 4. biosphere Is it Biosphere?

    asked by Helena
  73. Adult education

    Mike becomes angry when he can’t solve a mathematical problem, and slams his book down on the desk. Since his behavior is disruptive to his classmates, you wish to devise a scale by which you can gauge the impact it has on his fellow students. In doing

    asked by Soso
  74. Pre calculus

    Find all roots f(x)- x^3+2x^2-15x+30 Factor f(x) completely. I can't find any roots and always get a remainder with 1, -1, 2, -2 What do you do if you cannot find a root?? Using Calc button on ti84 I got X= -5.619 Y=1.4E-11 Still can't find zeros...

    asked by Steve
  75. Adult education

    To find the ZPD of a given student,you should

    asked by Soso
  76. Math

    what is the degree of the polynomial 4x-2+5x^2?

    asked by Alice PLEASE HELP ME
  77. Math

    Identify the extraneous solution when solving √x+2= x

    asked by Alice PLEASE HELP ME
  78. math

    what does sin2x/cos2x equal to?

    asked by bobby
  79. Math

    Identify the extraneous solution when solving √x+2= x

    asked by I DONT UNDERSTAND
  80. Statistics

    You take a trip by air that involves three independent flights. If there is an 67% chance each specific leg of the trip is on time, what is the probability all three flights arrive on time? (Round your answer to 3 decimal places.) Probability= ? My answer

    asked by Ryan
  81. physics

    An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.13 109 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser? (a) electric field (b)

    asked by Anonymous
  82. statistics

    Collina’s Italian Café in Houston, Texas, advertises that carryout orders take about 25 minutes (Collina’s website, February 27, 2008). Assume that the time required for a carryout order to be ready for customer pickup has an exponential distribution

    asked by Vanessa
  83. Grammar

    Which version of this word is correct? School work or schoolwork?

    asked by Anonymous
  84. statistics

    Given that z is a standard normal random variable, compute the following probabilities (to 4 decimals). P(z -1.0) P(z -1.0) P(z -1.5) P(z -2.5) P(-3 < z 0)

    asked by Vanessa
  85. English

    1. Diurnal: nocturnal:: A. Warm: hot B. hot: cold C. Night: day D. Near: far Is it c? 2. Night: darkness:: A. Honesty: truthfulness B. sight: eye C. Height: fear D. Bravery: recklessness Is it a?

    asked by Anonymous
  86. drama

    In act 3, scene 1, who hears these words from titania? A. Bottom B. Oberon C. Peaseblossom D. Pick

    asked by latasha
  87. social studies check answers

    1.D 2.A 4.C 1.“Along the southern coast of Brazil the central plateau descends in high, steep escarpments. It towers over the waves and moves back in ridges, leveling off from the peaks of the coastal ranges … As it continues along to the northern

    asked by matt
  88. Chemistry

    what is the pH and pOH of a solution made by adding water to 15 grams of HCl until the volume of the solution is 2500mL?

    asked by Lena
  89. Biographical Essay Evaluation (Writeacher)

    Write a 3-paragraph Biographical Essay. Discuss your experiences with summmer: the things you enjoyed and the things you missed about school. I am beginning to simplfy my writting, as Bob suggested. However, I am going to sumbit the only the first

    asked by Anonymous
  90. statistics

    You are responsible for planning the parking needed for a new 256-unit apartment complex, and you are told to base the needs on the statistic “average number of vehicles per household is 1.9.” Which average (mean, median, mode) would be best if: •

    asked by Bridge
  91. English

    1. Diurnal: nocturnal:: A. Warm: hot B. hot: cold C. Night: day D. Near: far Is it b?

    asked by Anonymous
  92. college chemistry

    Which base listed below would be the best to creat a buffer having a pH of 5.0230? hydrazine, Kb = 8.90e-7 methylamine, Kb = 3.70e-4 ethanolamine, Kb = 3.20e-5 pyridine, Kb = 1.40e-9

    asked by hershi
  93. Chemistry

    what is the pH and pOH of a solution made by adding water to 15 grams of HCl until the volume of the solution is 2500mL?

    asked by Anonymous
  94. Physics

    Acceleration due to gravity is independent of mass, but the force is not. Determine the final velocity of the following objects and the force generated by the same objects as they are dropped from the given heights. 10 kg 2.5 meters 7 kg 5.5 meters 0.5 kg

    asked by Anonymous
  95. History

    The Missouri Compromise settled one dispute, but contained a provision that began another battle

    asked by Kathy
  96. Civil War

    3.) The issue of the Mexican War divided the North and South

    asked by Kathy
  97. English

    Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Sumptuous, Homogeneous, Surreptitious. A. Despite their many differences, the population was a HOMOGENOUS group that, at bottom,

    asked by Anonymous
  98. English

    Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Capitulate, Caustic, Hierarchy, Iconoclast, Placid. A. While he enjoyed the work, the rigid CAUSTIC in the company meant his

    asked by Anonymous
  99. reading

    1. list three example of verbal irony and explain how each contribute to the suspense and sinister tone of the narrative *Verbal Irony - Fortanato toasts "to the buried that repose around us" *, “My dear Fortunato, you are luckily met.” However, he

    asked by Reina B.
  100. ENGLISH

    Please correct me if I'm wrong on any of this thanks! From the words below supply the words that complete the sentences. Capitulate, Caustic, Hierarchy, Iconoclast, Placid. A. While he enjoyed the work, the rigid HIERARCHY in the company meant his

    asked by Anonymous
  101. English help

    Put the following words in the correct place in these sentences. Revoke, Provoke, Invoke A. If we put something off until later, we REVOKE it. And something done for posterity is done for PROVOKE. If a Congressional Medal of Honor is awarded posthumously,

    asked by Anonymous
  102. Biographical Essay Evaluation (Writeacher)

    My second paragraph: "Free time is another one of my favorite things about summer. Not being preoccupied by some kind of assignment or curricular activity brings me happiness beyond belief. It enables me to spend time with my family, to take part in the

    asked by Anonymous
  103. social studies(updated answers)--

    1.D 2.A 4.C 1.“Along the southern coast of Brazil the central plateau descends in high, steep escarpments. It towers over the waves and moves back in ridges, leveling off from the peaks of the coastal ranges … As it continues along to the northern

    asked by matt
  104. Biographical Essay Evaluation (Writeacher)

    Third paragraph: "Nevertheless, despite my love for summer freedom, there are a couple of things I missed about school. Learning new and self-improving information, for instance, is one of them. How relieved I remember feeling when my teacher, Mrs.

    asked by Anonymous
  105. Biographical Essay Evaluation (Writeacher)(All)

    This is my entire, revised essay. "A strong sense of freedom is one of my favorite things about summer. My freedom in summer lessens stress. It protects me from the pressure of incomplete schoolwork. It shields me from the worry of disappointing grades and

    asked by Anonymous
  106. Physics 141

    x=3.5Cos(8pi.t) Amplitude=3.5m What is the frequency?

    asked by dakota22
  107. Physics 141

    x=3.5cos(8pi.t) Amplitude=3.5m Frequency?

    asked by dakota22
  108. Science

    Give 2 examples for sources of electricity?

    asked by Nnn
  109. college chem

    What would the [OH-] be after addition of 17.47 mL of 0.1000 M NaOH to 25.00 mL of 0.1000 HA (a weak acid, Ka = 3.16e-4)?

    asked by hershi
  110. Physics 141

    A bicycle wheel resting against a small step whose height is h = 0.125 m. The weight and radius of the wheel are W = 23.1 N and r = 0.330 m, respectively. A horizontal force vector F is applied to the axle of the wheel. As the magnitude of vector F

    asked by dakota22
  111. Literature--Please, help me!

    These questions regard the essay "Georgia O'Keeffe" by Joan Didion. 1. What do the words "style is character" mean? A: This saying merely means that an artist's character is responsible for his or her artistic choices. 2. Explain how the statement is

    asked by Anonymous
  112. math

    Take west to be the positive direction. The height of a sloped roof above the place where I stand is h = 12 feet (see the figure below). If I move 3 feet west, the height is 10 feet. If I move 2 additional feet west, what is the height of the roof above

    asked by Jenna
  113. Grammar

    The following senetences are inverted. Write C if the subject-verb agreement is correct. Write I if the subject-verb agreement is incorrect. Then, on the line following each sentence, write the correct form of the verb. 1. Was Lyndon Johnson the next

    asked by Anonymous
  114. Grammar

    Rewrite the paragraph, correcting all errors in subject-verb agreement. In this article about Arthur Ashe, there is several stories about the tennis player's inner strength. Here is some examples: Ashe did not let the other players know what he was

    asked by Anonymous
  115. college chem

    Determine the molar solubility of AgBr (Ksp = 5.40e-13) in 2.502 M NH3 if the complex ion [Ag(NH3)2]+ forms with a Kf = 1.70e7 will I need to make an chemical equation using the compounds they give me? and then do an ICE table?

    asked by hershi
  116. To TOM

    I accidentally erased your post on the hydrolysis of various anions. The answer is Kb(for the anion) = (Kw/Ka for the Ka for the acid) where Ka will be Ka for monoprotic acids, k2 for diprotic acids, or k3 for triprotic acids So to make OH^- the smallest

    asked by DrBob222